Hdf5 1 8 (#255)

* close #195. (#196)

* Update HDF5PluginMacros.cmake

* Update HDF5PluginMacros.cmake

* Restores maintainer mode in the autotools (#200)

Maintainer mode should be enabled in development branches.

Also adds helpful commenting.

Add script bin/switch_maint_mode.

Add file changes generated by bin reconfigure in
    src/H5Edefin.h
    src/H5Einit.h
    src/H5Epubgen.h
    src/H5Eterm.h

* Update MANIFEST for switch_maint_mode.

* Update so numbers to match 1.8.22 release.

* Updated configure with reconfigure.

Co-authored-by: H. Joe Lee <[email protected]>
Co-authored-by: Dana Robinson <[email protected]>

configure

@@ -26438,13 +26438,14 @@ esac
 
 
 ## ----------------------------------------------------------------------
-## Does the struct stat have the st_blocks field?  This field is not Posix.
+## Does the struct stat have the st_blocks field? This field is not POSIX.
 ##
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for st_blocks in struct stat" >&5
 $as_echo_n "checking for st_blocks in struct stat... " >&6; }
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+  #include <sys/stat.h>
 #ifdef FC_DUMMY_MAIN
 #ifndef FC_DUMMY_MAIN_EQ_F77
 #  ifdef __cplusplus
@@ -26456,11 +26457,10 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 int
 main ()
 {
-
+struct stat sb; sb.st_blocks=0;
   ;
   return 0;
-}[
-  #include <sys/stat.h>],[struct stat sb; sb.st_blocks=0;])
+}
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :